[TASK] Log exception when metadata extraction fails

When the FAL metadata extraction task fails with an exception
this exception will now be logged via logException(), which is
added as a new method to AbstractTask. This method logs via
GeneralUtility::sysLog and the Logging API.

Resolves: #66217
Releases: master
Change-Id: If7d56148d9ee3ec3ea143bc422eeff4f2f4b8c03
Reviewed-on: https://review.typo3.org/51965


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Markus Sommer <markussom@posteo.de>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>